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136 Chapter 10
GSM/EDGE Measurement Application
Measurements
Measurements
Description Specifications Supplemental Information
EDGE Error Vector Magnitude
(EVM)
3π/8 shifted 8PSK modulation,
3π/4 shifted QPSK, π/4 shifted
16QAM, –π/4 shifted 32QAM
modulation in NSR/HSR with pulse
shaping filter.
Specifications based on 200 bursts
Carrier Power Range at RF Input +24 to −45 dBm (nominal)
EVM
a
, rms
a. EVM and frequency error specifications apply when the Burst Sync is set to Training Sequence.
Operating range 0 to 20% (nominal)
Floor
NSR/HSR Narrow/HSR Wide
(all modulation formats)
0.7% 0.5% (nominal)
Accuracy
b
EVM range 1% to 10% (NSR 8PSK)
EVM range 1% to 6% (NSR
16QAM/32QAM)
EVM range 1% to 8% (HSR QPSK)
EVM range 1% to 5% (HSR
16QAM/32QAM)
b. The definition of accuracy for the purposes of this specification is how closely the result meets the
expected result. That expected result is 0.975 times the actual RMS EVM of the signal, per 3GPP TS
45.005, annex G.
±0.5%
Frequency error
a
Initial frequency error range ±80 kHz (nominal)
Accuracy
±5 Hz
c
+ tfa
d
c. This term includes an error due to the software algorithm. The accuracy specification applies when
EVM is less than 1.5%.
d. tfa = transmitter frequency × frequency reference accuracy
IQ Origin Offset
DUT Maximum Offset −15 dBc (nominal)
Maximum Analyzer Noise Floor −50 dBc (nominal)
Trigger to T0 Time Offset
Relative accuracy
e
±5.0 ns (nominal)